Gas line sizing and pressure test


Old 03-20-14, 03:40 PM
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Gas line sizing and pressure test

I am running a new 50 lf gas line from the meter for a dryer. What formula do I use to size the line. Also what is the standard pressure for the 24hr test. Finally a 5' length of the pipe will have to punch through a exterior wall run across the roof and 90 down through a flat roof into a garage. Does the 6" off the deck rule apply to gas lines on a roof? I will be using a 6" roof jack for the penetration but I cannot find specific code language that refers to pipes on roofs or spacing of supports on roofs.

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Old 03-20-14, 06:23 PM
Join Date: May 2001
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All your questions would be best directed to the local inspector. The reason is this when I used to work in commercial plumbing we ran miles of gas pipe and we put 100 pounds of pressure. I have since worked on my own houses and have been told 15 lbs by one and 20 by another. Your questions sound like you want to do this according to code and that is good. The code to follow is whatever the local jurisdiction follows. In that code will be the formula you seek.

Good Luck

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